Bioremediation of cadmium by growing Rhodobacter sphaeroides:: Kinetic characteristic and mechanism studies

被引：118

作者：

Bai, Hong-Juan ^{[1
,2
]}

Zhang, Zhao-Ming ^{[2
]}

Yang, Guan-E ^{[2
]}

Li, Bao-Zhen ^{[2
]}

机构：

[1] N Univ China, Sch Chem Engn & Environm, Taiyuan 030051, Peoples R China

[2] Shanxi Univ, Coll Life Sci & Technol, Shanxi 030006, Peoples R China

来源：

BIORESOURCE TECHNOLOGY | 2008年 / 99卷 / 16期

关键词：

Rhodobacter sphaeroides; cadmium; kinetic characteristic; bioremediation mechanism;

D O I：

10.1016/j.biortech.2008.01.071

中图分类号：

S2 [农业工程];

学科分类号：

0828 ;

摘要：

The removal kinetic characteristic and mechanism of cadmium by growing Rhodobacter sphaeroides were investigated. The removal data were fitted to the second-order equation, with a correlation coefficient, R-2 = 0.9790-0.9916. Furthermore, it was found that the removal mechanism of cadmium was predominantly governed by bioprecipitation as cadmium sulfide with biosorption contributing to a minor extent. Also, the results revealed that the activities of cysteine desulfhydrase in strains grown in the presence of 10 and 20 mg/l of cadmium were higher than in the control, while the activities in the presence of 30 and 40 mg/l of cadmium were lower than in the control. Content analysis of subcellular fractionation showed that cadmium was mostly removed and transformed by precipitation on the cell wall. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：7716 / 7722

页数：7

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